1390663866 has 16 divisors (see below), whose sum is σ = 2828469600. Its totient is φ = 455697648.

The previous prime is 1390663861. The next prime is 1390663891. The reversal of 1390663866 is 6683660931.

It is not an unprimeable number, because it can be changed into a prime (1390663861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1963861 + ... + 1964568.

It is an arithmetic number, because the mean of its divisors is an integer number (176779350).

Almost surely, 2^1390663866 is an apocalyptic number.

1390663866 is an abundant number, since it is smaller than the sum of its proper divisors (1437805734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1390663866 is a wasteful number, since it uses less digits than its factorization.

1390663866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928493.

The product of its (nonzero) digits is 839808, while the sum is 48.

The square root of 1390663866 is about 37291.6058383117. The cubic root of 1390663866 is about 1116.1966724080.

The spelling of 1390663866 in words is "one billion, three hundred ninety million, six hundred sixty-three thousand, eight hundred sixty-six".